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Hallyn" , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Chao Peng , Fuad Tabba , Jarkko Sakkinen , Yu Zhang , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , Vlastimil Babka , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata , "Kirill A . Shutemov" References: <20230718234512.1690985-1-seanjc@google.com> <110f1aa0-7fcd-1287-701a-89c2203f0ac2@amd.com> <2f98a32c-bd3d-4890-b757-4d2f67a3b1a7@amd.com> From: "Nikunj A. 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Dadhania wrote: >> On 7/24/2023 10:30 PM, Sean Christopherson wrote: >>>> /proc//smaps >>>> 7f528be00000-7f5c8be00000 rw-p 00000000 00:01 26629 /memfd:memory-backend-memfd-shared (deleted) >>>> 7f5c90200000-7f5c90220000 rw-s 00000000 00:01 44033 /memfd:rom-backend-memfd-shared (deleted) >>>> 7f5c90400000-7f5c90420000 rw-s 00000000 00:01 44032 /memfd:rom-backend-memfd-shared (deleted) >>>> 7f5c90800000-7f5c90b7c000 rw-s 00000000 00:01 1025 /memfd:rom-backend-memfd-shared (deleted) >>> >>> This is all expected, and IMO correct. There are no userspace mappings, and so >>> not accounting anything is working as intended. >> Doesn't sound that correct, if 10 SNP guests are running each using 10GB, how >> would we know who is using 100GB of memory? > > It's correct with respect to what the interfaces show, which is how much memory > is *mapped* into userspace. > > As I said (or at least tried to say) in my first reply, I am not against exposing > memory usage to userspace via stats, only that it's not obvious to me that the > existing VMA-based stats are the most appropriate way to surface this information. Right, then should we think in the line of creating a VM IOCTL for querying current memory usage for guest-memfd ? We could use memcg for statistics, but then memory cgroup can be disabled and so memcg isn't really a dependable option. Do you have some ideas on how to expose the memory usage to the user space other than VMA-based stats ? Regards, Nikunj